Repeated "Bounce processing info" system emails?

I am getting the same “Bounce processing info” system message each time my cron runs my commandline:

/usr/bin/php /var/www/vhosts/ -pprocessbounces -c/var/www/vhosts/ >/tmp/processbounces-out.txt

This problem began after a server migration and phplist upgrade from 3.2.5 to 3.3.1

The body of the system email is:

Report of advanced bounce processing:
email blacklisted by bounce rule 1

I searched and clicked the “Remove subscriber” button.
The repeated emails have stopped for now.
I will see after my next mail run, whether this bounce processing problem persists.